japanese i18nService not have grouping and validate values

[kawatanabe]

I tried to use grid grouping by 'ja' locale ,but not worked.
So, i18nService does not have grouping and validate values.
(other language has each values)

[mportuga]

If you know the proper translations for Japanese, we will gladly accept a PR with those translations.

[mportuga]

This issue was fixed on version 4.0.4 with the following commit:
47e78d1